<template>
  <div class="pagination">
    <!-- 上 -->
    <button :disabled="pageNo==1" @click="$emit('getPageNo',pageNo-1)" class="move">&lt;上一页</button>
    <button v-if="startNumAndEndNum.start > 1" @click="$emit('getPageNo',1)" class="page">1</button>
    <button v-if="startNumAndEndNum.start > 2" class="point">...</button>

    <!-- 中间部分 -->   
    <button class="page" v-for="(page, index) in parseInt(startNumAndEndNum.end)" :key="index" v-show = "page >= startNumAndEndNum.start" :class="{active:isPage(page)}" @click="$emit('getPageNo',page)">{{page}}</button>
    <button v-if="startNumAndEndNum.end < totalPage-1" class="point">...</button>
    <button v-if="startNumAndEndNum.end < totalPage" @click="$emit('getPageNo',totalPage)" class="page">{{totalPage}}</button>
    <button :disabled="pageNo==totalPage" @click="$emit('getPageNo',pageNo+1)" class="move">下一页&gt;</button>
    <!-- <button>共{{ totalPage }}页</button> -->

    <!-- <button style="margin-left: 30px">共 {{ total }} 条</button> -->
  </div>
</template>

<script>
export default {
  name: "Pagination",
  props: ["pageNo", "pageSize", "total", "continues"],
  //计算属性
  computed: {
    totalPage() {
      return Math.ceil(this.total / this.pageSize);
    },
    startNumAndEndNum() {
      let start = 0,end = 0;
      start = Math.max(1, this.pageNo - Math.floor(this.continues / 2));
      end = Math.min(this.totalPage,this.pageNo + Math.floor(this.continues / 2));
      return {start,end};
    },
  },
  methods:{
    isPage(page){
      return page==this.pageNo;
    }
  }
};
</script>

<style lang="less" scoped>
.pagination {
  text-align: center;
  button {
    margin: 0 5px;
    background-color: #fff;
    color: #606266;
    outline: none;
    border-radius: 2px;
    padding: 0 4px;
    vertical-align: top;
    display: inline-block;
    font-size: 13px;
    min-width: 35.5px;
    height: 28px;
    line-height: 28px;
    cursor: pointer;
    box-sizing: border-box;
    text-align: center;
    border: 0;

    &[disabled] {
      color: #c0c4cc;
      cursor: not-allowed;
    }
    &.active {
      cursor: not-allowed;
      background-color: #ec3838;
      color: #fff;
    }
  }
  .point{
    padding: 0;
    margin: 0 -5px;
  }
}
.active {
  background: skyblue;
}
.move{
  &:hover{
    color: #ec3838;
  }
}
.page{
    border: 1px solid #aaa !important;
    border-radius: 5px !important;
    &:hover{
      border: 1px solid #111 !important;
    }
}
</style>
